Grant Baker Posted January 25, 2019 Report Share Posted January 25, 2019 Hi, I know it's been asked before, but can't find it... Has anybody tried using one of these sort of sensors in a petrol turbo car? https://www.ebay.com/itm/EBP-Sensor-Exhaust-Back-Pressure-Fits-Ford-Powerstroke-97-03-6-0L-7-3L/183539423102?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D20131003132420%26meid%3Dd260f2dc748b49108b2122a9620e37e5%26pid%3D100005%26rk%3D2%26rkt%3D12%26sd%3D201900602277%26itm%3D183539423102&_trksid=p2047675.c100005.m1851 I assume the EGT is going to be too high, but is there a sensor that can screw directly (or nearly directly) into an exhaust manifold to measure EMAP? Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 25, 2019 Report Share Posted January 25, 2019 I have never seen one connected directly. The sensor needs to be protected from the temperature and contamination/condensation. Usually a length of stainless tube from manifold running "uphill" to a small canister - normally filled with steel wool, then the EMAP sensor is connected to that. https://racespeconline.com/products/t1-emap-canister https://turbosource.com/products/full-function-engineering-emap-exhaust-manifold-pressure-canister https://www.xenocron.com/products/xenocron-emap-backpressure-kit?variant=5071867543589 Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted January 26, 2019 Author Report Share Posted January 26, 2019 I know that some OEMs have EMAP sensors. I have to assume that they are only diesels then with lower EGT? Certainly never seen a length of tube / canister on a car as OE... Quote Link to comment Share on other sites More sharing options...
Ducie54 Posted January 26, 2019 Report Share Posted January 26, 2019 I just use a Honeywell sensor. With the T1 race canister and brake hose in a few loops. No issues over the last few years running. Quote Link to comment Share on other sites More sharing options...
Stevieturbo Posted January 27, 2019 Report Share Posted January 27, 2019 Weld a brake pipe fitting onto the manifold/collector. Then you can just screw in some brake pipe to dissipate the heat before the sensor, and when done screw in a nipple to seal it up. Or drill, tap, whatever suits Quote Link to comment Share on other sites More sharing options...
Joe Bucci Posted January 29, 2019 Report Share Posted January 29, 2019 Here is an example of mine. Source is EGR port, which may skew the number from actual, but I don't have a way to source off the manifold of turbine housing right now. The far side of the canister will go to a braided line. The braided line will go to a firewall mounted pressure transducer. I suppose the transducer could be screwed directly into the canister. Davidv 1 Quote Link to comment Share on other sites More sharing options...
thedbaz Posted March 21, 2023 Report Share Posted March 21, 2023 hello, sorry to bring this old thread back to life, but i recently purchased the Race Spec EMAP Kit. https://racespeconline.com/collections/racespec/products/racespec-emap-backpressure-kit i am trying to figure out what sensor i need to get for it. they recommended i get the same as my MAP sensor, which i am using my built in 7 BAR MAP sensor on the 350z LinkECU. my question is, do i need a MAP sensor or can i get a regular pressure sensor? 7 BAR MAP sensor: https://lowdoller-motorsports.com/collections/pressure-sensors/products/7-bar-map-sensor-pn-899007 https://www.motionraceworks.com/products/rife-7-bar-map-sensor-1-8-npt-52-7bar 0-150 PSI sensor: https://lowdoller-motorsports.com/collections/pressure-sensors/products/copy-of-0-100-psi-5v-pressure-sensor https://www.motionraceworks.com/products/rife-150-psi-pressure-transducer-1-8-npt-52-150psi i would find it hard to believe that the exhaust would even be in vacuum, but im not sure. ive seen some kits show them with regular PSI sensors and others with MAP sensors. thanks for the help!! Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 21, 2023 Report Share Posted March 21, 2023 You typically want an absolute pressure sensor rather than gauge or sealed gauge, not so much because you expect a vacuum, but typically because you want to see pressure differential across the engine or across the turbine - so you need to factor in atmospheric pressure which is acting on both the intake and exhaust. It doesnt necessarily need to match the same range as the MAP sensor, just something with enough range to measure the anticipated max exhaust manifold pressure. Either of those 7bar MAP sensors would be fine. Quote Link to comment Share on other sites More sharing options...
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